{"created":"2023-03-31T02:02:40.791306+00:00","id":4758,"links":{},"metadata":{"_buckets":{"deposit":"f934a6a8-28a9-49c2-adf0-fcdc1abd7759"},"_deposit":{"id":"4758","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"4758"},"status":"published"},"_oai":{"id":"oai:nied-repo.bosai.go.jp:00004758","sets":[]},"author_link":[],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2009-06","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"965","bibliographicPageStart":"958","bibliographicVolumeNumber":"177","bibliographic_titles":[{"bibliographic_title":"GEOPHYSICAL JOURNAL INTERNATIONAL","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The scattering coefficient is one of the most fundamental parameters by which to quantify the scattering intensity for waves as a function of scattering angle and wave frequency. This study presents a derivation of the scattering coefficient for linear long-wave tsunami equations in randomly fluctuating sea-bottom topography using the first-order Born approximation. The scattering coefficient is directly related to the power spectrum density function of fluctuations in the bottom topography and shows a strong tsunami-wavelength dependence. The scattering regime is determined by the normalized wavenumber ak, where k is the tsunami wavenumber and a is the correlation distance of the fluctuating sea-bottom topography. The scattering pattern for small wavenumbers, ak << 1, is symmetric in the forward and backward directions, whereas the pattern for large wavenumbers, ak >> 1, shows small-angle scattering around the forward direction. Based on the theoretically derived scattering coefficient, we evaluate the excitation of tsunami coda and leading-wave attenuation as a function of the normalized wavenumber. The coda energy for small wavenumber ak << 1 is proportional to k(3), whereas the energy for large wavenumber ak >> 1 is proportional to k(-p+3) when the power spectral density function of the sea-bottom fluctuation is characterized by a power law with the exponent of -p in large wavenumber. The scattering attenuation represented by the inverse of the quality factor (Sc)Q(-1) is proportional to k(2) for small wavenumber ak << 1, whereas (Sc)Q(-1) is proportional to k(-p+2) for large wavenumber ak >> 1.","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"WILEY-BLACKWELL PUBLISHING, INC","subitem_publisher_language":"en"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1111/j.1365-246X.2009.03988.x"}}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0956-540X","subitem_source_identifier_type":"ISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Tatsuhiko Saito","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Takashi Furumura","creatorNameLang":"en"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_title":"Scattering of linear long-wave tsunamis due to randomly fluctuating sea-bottom topography: coda excitation and scattering attenuation","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Scattering of linear long-wave tsunamis due to randomly fluctuating sea-bottom topography: coda excitation and scattering attenuation","subitem_title_language":"en"}]},"item_type_id":"40001","owner":"1","path":["1670839190650"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-30"},"publish_date":"2023-03-30","publish_status":"0","recid":"4758","relation_version_is_last":true,"title":["Scattering of linear long-wave tsunamis due to randomly fluctuating sea-bottom topography: coda excitation and scattering attenuation"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-08T06:09:22.891205+00:00"}